Floor treatment device



FIG. 1 is a perspective view of a floor treatment device;

FIG. 2 is a rear elevation view of the design shown in FIG. 1; and,

FIG. 3 is a top plan view of the design shown in FIG. 1.

The broken line showing of the floor treatment device is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a floor treatment device, as shown and described. 